Malicious PDF — malware analysis report

Static analysis result for SHA-256 9748a66e340f11ba…

MALICIOUS

PDF

49.2 KB Created: 2020-10-14 22:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 736492bf1f6ece96532ec8ac6cbbb4ef SHA-1: 30c9544ec87fc5c38878be016d8e31771da41ff8 SHA-256: 9748a66e340f11bac10ace4c55210e996b99aeb604e68faf295eb9f3c97fa132
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The embedded URL points to 'cctraff.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to lure the user to a malicious site. The presence of multiple embedded PDF links, some pointing to benign Shopify URLs and others to unknown domains, indicates a link farm strategy, likely to obscure the primary malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=you+are+the+reason+mp3+cover+wapka In PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/5146662.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/xibebaje-morebadekedazu-vofubotegisi-notune.pdfIn PDF document text
    • https://site-1048221.mozfiles.com/files/1048221/55312576568.pdfIn PDF document text
    • https://site-1041861.mozfiles.com/files/1041861/rupofibirovenepap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6340/0861/files/birds_of_a_feather_flock_together_full_saying.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8153/4102/files/best_eyebrow_tweezers_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8970/0010/files/webafojisoxenujugato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9009/3239/files/vumefar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9267/5227/files/4804094443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55597778-5da0-4510-85b3-b49063b09f05/karadujolezadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd9d41b-3fa4-4fa9-b0b5-d17fde5eb204/5400072728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23fb014-b92d-4c52-8e42-faf2b6609f1b/xobotiramu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2ea0b6-3988-4c56-9597-b1094190c141/forirufotafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4969/6418/files/ribimopasow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8721/9867/files/50124086369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5289/1297/files/zokenuvomuv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6171 5480 bytes
SHA-256: ad5b6f6286559d939c20561d6866f2e4f6a0ecd9bde664fbbdda8a7cd4416ca8
font_01_sfnt_off000073fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73FD 10308 bytes
SHA-256: 8e373cada091a4f53cb49fad677093f8470f79095fc6e6873dbf13f1d2c20f5d
font_02_sfnt_off0000978a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978A 18836 bytes
SHA-256: 02cd9f06bdf5630cc6a5f7e941ae707abc8cc971bc80501ef899a52deda33f76

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